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Cylindrical internal reflectance infrared spectroscopy (CIR-FTIR) was used for the determination of the transport properties of hydrocarbons in zeolite L at high temperatures and pressures. This was the first time that the intracrystalline difisivity of hydrocarbons in microporous media could be determined under supercritical conditions by using a dynamic technique. The study investigated the self-difiion of n-heptane, the counterdifision of n-hexane and 1-hexene, and the codifSusion of n-heptane and pxylene in zeolite L under subcritical and supercritical conditions. The d i f i i o n time constants obtained for the single and binary systems showed that the diffusion within the pore was reduced significantly under supercritical conditions (i.e., liquidlike behauiod as the hydrocarbon density within the pore was increased.